Composite tubular member with axial fibers adjacent the side walls

The tubular member of claim 5 in which the outer composite cylindrical member contains from 1 to about 6 percent fibers oriented approximately 90.degree. to the longitudinal axis of the tubular member.

The tubular member of claim 5 in which the inner solid composite members contain from about 5 to about 25 percent fibers oriented .+-.45.degree. to the longitudinal axis of the tubular member.

A composite tubular member comprising an outer composite cylindrical member containing fibers oriented to resist internal pressure and provide low bending stiffness and two smaller equally sized inner composite members of generally sine wave configuration positioned at their bases adjacent diametrically opposite inside walls of the outer composite cylindrical member, said inner members containing fibers oriented to provide high axial stiffness, high tensile strength and positioned to provide low bending stiffness and fibers oriented to resist shear stress, wherein the amplitude of the sine wave configured inner members varies from 0.5 to 3.0 times the base of such members.

A composite tubular member comprising an outer composite cylindrical member containing fibers oriented to resist internal pressure and provide low bending stiffness and two smaller equally sized inner composite members of generally sine wave configuration positioned at their bases adjacent diametrically opposite inside walls of the outer composite cylindrical member, said inner members containing fibers oriented to provide high axial stiffness, high tensile strength and positioned to provide low bending stiffness and fibers oriented to resist shear stress, wherein the sine wave configured portions are encapsulated with cross-plied fibers oriented to resist shear stress and delamination.